Hot-air furnace.



C. H. LEE.

7 HOT AIR FURNACE. APPLICATION FILED MAR. 29, 1912.

Patented Nov. 19,1912.

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G. H. LEE, HOT AIR FURNACE.

APPLICATION FILED MAR. 29, 1912. 1,044,669.

2 SHEETS-SHEET 2.

WTNESEEE- v NVENTU 4% MM a! Mmzw COLUMBIA PLANOGRAPH 60., \VASHINPatented Nov. 19, 1912.

tlhlllTFl) STATES PATENT OFFICE.

CHARLES H. LEE, OF TOLEDO, OHIO.

HOT-AIR FURNACE.

To all whom it may concern:

.Be it known that I, CHARLES H. LEE, a citizen of the United States,residing at Toledo, in the county of Lucas and State of Ohio, haveinvented new and useful Improvements in Hot-Air Furnaces, of which thefollowing is a specification.

lily invention relates to a hot air furnace, and has for its object toprovide an economical furnace of the kind, of simple and inexpensiveconstruction, and that is adapted to utilize an increased percentage ofthe heat generated therein. 1 accomplish these objects by theconstruction, arrangement, and combination of parts as hereinafterdescribed and illustrated in the drawings, in which Figure l is a viewin vertical diametric section of a furnace constructed in accordancewith my invention, the section being on line XX of Fig. 2. Fig. 2 is asimilar View on line XYY of Fig. 1. Fig. 3 is a horizontal section online ZZ of Fig. 1 looking toward the top. Fig. l is a side elevation ofthe top section. of the furnace body. Fig. 5 is a top view of the feeddoor section of the furnace body. Fig. 6 is a section on line ZZ of Fig.1 looking downward. Fig. 7 is a horizontal section of a flue section ofthe furnace body showing a water pipe from a water service systemintroduced in the hot air flues. Fig. 8 is a perspective view of an airline section of the furnace body, detached. Fig. 9 is an enlarged brokenaway section through a joint of the line sections, showing thecomplementary V groove and tenon.

In the drawings, 1 designates the fire pot and ash pit section, 2 thefeed door section mounted on the fire pot section, 3, 3, 3, 3, air fluesections mounted on the feed door section, one above the other, 4: a topsection mounted on the top of the air flue sections and completing thefurnace body, 5 a cylindrical casing inclosing the furnace body, 6 adome for the casing having radial flue openings 7 for the attachmentthereto of the distributing hot air pipes (not shown), 8 the feed door,9 the ash pit door, 10 the smoke flue pipe, 11 the cold air inlet pipes,12, 12, 12, 12, partitions radial to the casing and dividing the airspace between the easing and the furnace body into four cham-Specification of Letters Patent.

Application filed March 29, 1912.

Patented Nov. 19, 1912.

Serial No. 687,006.

hers, 13, l3, l8, 13 the baiile plates directing the air currentsthrough the flue sections 3, and 14 a front casing plate surrounding thedoor openings of the sections 1 and 2.

The .fire pot section 1, at the top, is provided with a flange l,projecting outwardly flush with the top of the section, the outer edgesof the flange forming a square, and in the top side of the flange isformed a V- shaped groove g, parallel with the edges of the flanges, andthe top section 4: is provided, flush with its bottom, with a flarfgc l,projecting outwardly, the outer edges of which also form a square ofequal dimensions with the flange of the section 1, and the bottom sideof the flange 4C is provided with a V shaped tenon bead 7) parallel withthe outer edges of the flange 4, and of equal dimensions of the groove 9in the top of section 2. The sections 3 are hollow squares of equalcorresponding dimensions and are castings formed in molds made by thesame pattern, and extending between the opposite sides 3 of eachsection, at equal intervals, are a plurality of hollow cylindrical fluesf, having openings extending through the sides 3'. The tops of the sidesof each section 3 are provided with a V shaped joint groove g,complementary to the V oint bead b of the top section i, and the bottomedges of each section 3 are provided. with a V joint bead Z),complementary to the V joint groove 9 of the section 2. Thusconstructed, all of the sections 3, are interchangeable and adapted tobe used in any position between the top section 4 and the section 2.

The lower section 8 is mounted on the to of section 2 with its tenonhead 6 in the tenon groove 9 in the top of section 2, and with the finesf parallel with the feed door opening 8 of section 2, and the secondsection 3 is mounted on the lower section 3 with the fiues f at rightangles to the fines of the lower section, the third section 3 is mountedon the second section 3 with the fines j parallel with the fines of thelower section 3 and at right angles to the fines of the second section3, and the fourth and top section 3 is mounted on the third section 3with the fines f at right angles to those of the third, and parallelwith those of the second section, and each section has its joint bead b,fitted into the V groove 9 of the top of the next lower section, withplastic metallic cement in the grooves.

The top section at above the flange 4 is in the form of a truncateddome, and concentric to its outer wall 15 is the inner wall 16, integralwith the top 17, and an annular bottom 18, forming with the outer wall15, the top 17, and the inner wall 16, an annular flue chamber 19,having an exit flue opening 20, to which is connected the smoke fluepipe 10, and the radial slot openings 21 in the bottom 18 around thechamber 19, excepting a portion 22 extending a suitable distance eachway from the flue opening 20, the slot openings 21 being equal in theircombined capacity to the flue opening 20. Near the corners of the topsections 3, and opposite the parallel sides of the sections 3, areprovided the clamp rods 23, which extend through alined orifices in theflange 4 of the top section 1, and the flange l of the fire pot section1, the rods 23, having heads 24 at their top ends, and threaded endportions of their lower ends on which are run the nuts 25, by which thesections are firmly clamped together. The rods 23 are spaced from thesides of the sections 3, to receive the flanged inner edge portions 26of the radial partitions 12, the outer edge portions 27 of which areangled to abut the casing 5 with the body portions of the partitions extending radial to the corners of the sections 3 and 2, and are broadenedbelow the flange 1 and conformed to the contour of the fire pot and thesquare ash pit base of section 1. The partitions 12 divide the spacebetween casing and the combined sections of the furnace body into fourchambers a and a, and c and 0, the chambers a and a being opposite theends of the flues f of the first and third sections 3, and the chambersc and 0 are opposite the ends of the flues f of the second and fourthsections 3. Opposite the joint between the first and second sections 3,in the chamber a, and extending between the partitions 12 and betweenthe casing and the furnace body, is provided a battle plate 13, for thechamber a, which is adapted to direct air from the lower part of thechamber a through the flue f of the first section into the chamber a,and the chamber 0; is provided with a baflle plate 13, opposite thejoint between the third and fourth sections 3, which is adapted todirect the air from chamber a back to the chamber a above its baffleplate 13. The chamber a is provided with a baffle plate 13 opposite thejoint be tween the second and third sections 3, which is adapted todirect the air from below the baflie plate through the flues f of thesecond section 3, into the chamber 0', and the chamber c is providedwith a baffle plate 13, opposite the joint between the fourth section 3and the top section 4, which is adapted to direct the air from thechamber 0 back to the chamber 0, through the flues f of the fourthsection 3. The cold air flues 11 enter the casing in the lower part ofthe chambers a and c, and they are preferably branches of a main supplyduct, (not shown). Thus constructed, the heated gases generated in thefire pot, pass upward against the air flues f, in a tortuous coursearound and between the flues up to the top section 4, and their onlyescape being through the slots 21 in the bottom of the annular flue 19,they are prevented from passing direct from the fire pot to the flueopening 20, the effect of the slots 21 being to produce a more generaland even distribution of the gases of combustion as well to the endportions of the flues as to their central portions, whereby the sides ofthe sections 3 are more highly heated, and the radiating surface of thefurnace is greatly increased. The flues 7"", being also directly in thepath of the heated gases, provide a largely increased area of heatingsurface, and the inner walls of the flues likewise greatly increase theradiating surface, and the air in the flues becoming highly heatedproduces a rapid circulation of the air from the chambers a and 0through the flues f of the first and second sections 3, to the chambersa and a respectively, and from the chambers 64 and 0 back through theflues f of the third and fourth sections 3 to the chambers a and 0 abovetheir respective baffle plates, and thence upward in the chambers a and0 into the dome of the casing, and thence through openings in the domeand through hot air ducts to the rooms above. The baffle plates 13, inthe chambers 64 and 0, and the top of the section 4 con centric to theflue 19 also increase the area of heating and radiating surface,directly contributing to the heating of the air in the dome of thecasing.

The furnace thus constructed may also be made adapted to maintain asupply of hot water by extending a water service pipe 28 back and forththrough the flues of one or more of the sections 3, as shown in Fig. 5.

It will thus be seen, that by the construction shown and described Ihave produced a furnace, wherein the heating surfaces are brought moredirectly across the path of the heated gases of combustion, and the airto be heated is brought more directly in contact with the radiatingsurfaces, whereby a greatly increased percentage of the heat generatedin the fire pot, are absorbed by the air of circulation before the gasesof combustion reach the smoke flue 10.

l Vhile the portion of the fire box, between the fire pot section andthe top section is preferably constructed of the separable sections 3,it is manifest that a single casting comprising the air flues f,arranged as described, may be substituted for the sections 3, withoutdeparting from the principle of construction and operation of myfurnace, and I therefore do not limit myself to the use of separatesections.

What I claim to be new is,

1. In a hot air furnace, the combination with a fire pot section, havinga flange forming a square around its top portion, of a fire box mountedon the flange of the fire pot section, and having sides that are squarein horizontal cross section, and a top that is in the form of atruncated dome, said top having an annular Hue concentric within thedome wall, said fiue having a multiplicity of slot openings in itsbottom, and a main fine opening through the outer wall of the dome, andeach opposite pair of sides of the fire box having an upper and lowerseries of air Hues extending parallel and horizontally through the firebox and the sides, the series of fiues of one pair of sides alternatingwith series of fiues in the other pair of sides, and being at rightangles thereto in direction, a casing inclosing the furnace thus formed,vertical partitions opposite the corners of the fire box dividing theair space between the casing and the furnace int-o chambers, oneopposite each side of the fire box, a bafiie plate horizontally dividingeach chamber, and relatively arranged in opposite chambers to direct theair from one chamber through the lower series of fines to the otherchamber and back to the first chamber through the upper series of flues,and an air supply duct connected to the two chambers having thelowermost battle plates.

2. In a hot air furnace, the combination with a fire pot section havinga flange around its top portion, with the outer edges of the flangesforming a square, of a fire box comprising a feed door section adaptedto be mounted on the fire pot section, and a plurality of equalinterchangeable square sections mounted one above the other on the feeddoor section, each square section having a plurality of air fluesextending horizontally between and through two of its opposite sides,and a top section. having a dome portion provided with a bottom flangeadapting it to be mounted on the upper square section, and having anannular flue concentric to the wall of the dome, said fine beingprovided with bottom slot openings radial to the dome, and with a mainflue opening in the outer wall of the dome, said square sections beingeach arranged with its air fines at right angles to the next lower ornext higher square section, clamp rods extending through the flanges ofthe top and fire pot sections opposite the corners of the fire box, a.asing inclosing the furnace thus constructed, vertical partitionsextending from the corners of the firebox to the casing, and formingseparate air chambers, one opposite each side of the fire box, a baftleplate horizontally dividing each air chamber, one of said baflie platesof each opposite pair of chambers being above the lowest row of finesopening into one chamber of the pair, and one above the highest row offiues opening into the opposite chamber of the pair, and air supplyducts connected to the air chambers having the lowest and next lowestbafiie plates.

In testimony whereof I have hereunto set my hand, at Toledo, Ohio, this28th day of February, 1912, in the presence of two subscribingwitnesses.

CI-IARLES H. LEE.

In presence of MARK Vnvonnsrnn, FRANK W. MAOPHIO.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

